Carburetor



H. H. EARLE July 24, 1934.

CARBURETOR Filed June 6, 1953 5 Sheets-Sheet 1 m R 5 8 w in R mu 1 u \N u- M Q 3 ll mm H. ul x Nm. Q 5 8 3 a Harmon Jul 24, 1934.

H. H. EARLE CARBURETOR Filed June 6, 1953 s Sheets-Sheet 2 I nvenior Harmbn Earle H. H. EARLE CARBURETOR July 24, 1934.

Filed June 6, 1955 3 Sheets-Sheet 3 Invenior Harmon Ear/e V flllomey Patented July 24, 1934 r "FATE NT oFFIoE 1,96%,352 .CARBURETQR IEIarnriOn- H. Earle, Flint, Mich. Application June 6, 1933, Serial No. 674,572 1 Claim. (01. 261-51); I

This invention appertains to new and useful improvements in carburetors, such as are comj *monly employed in conjunction with internal combustion engines.

* The principalobjectof thepresent invention is to provide means for progressively admitting the c'hargeto the intake manifold in proportionto the speed-thereof. .1

7 Another important object of the presentin 1 'ventionis to provide a novel form of charge admitting :means, wherein the suction of the Y engine will act to open additional fuel communication with-the intake manifold as a supplement to the intake through the low speed inlet.

Another important objectof the invention is to provide means wherebythe air and fuel are 1 thoroughly mixed at the carburetor.

" Theseand various other important objects and advantages of the .invention will become apparent to the reader of the following specification.

In the drawings:

Figure 1 represents a vertical sectional view through the novel carburetor.

Figure 2 represents a vertical sectional view through the novel carburetor, this view showing the high speed valve controlling means in sec- 1139;

lijigure 3 represents a horizontal sectional view 1 1 taken substantially on line 3-3 of Figure 2.

Figure .51 represents a perspective View of the adjusting means for the high speed valve.

Figure 5 represents the bail employed with the high speed valve.

Figure 6 represents a perspective view of the tube.

Figure '7 represents a perspective view of the valve stem.

Figure 8 represents a perspective View of the valve needle.

Referring to the drawings wherein like humerals designate like parts, it can be seen in Figure 1 that numeral 5 represents the carburetor casting which is provided with the upwardly extending pipe section 6 within which the high speed fuel valve operating mechanism, generally referred to by numeral 7, is located, and with the horizontally disposed neck 8 open at its outer end and having the air passage controlling butterfly valve 9 operative therein. At the opposite side of the casting 5 from the neck 8 is the shell 10 of the float chamber, the same having the removable cap 11 and the float 12 operativetherein for regulating the fuel inlet valve 155 13 which has a connection 14 whereby the usual feed ring 22 therein.

fuel feed line, (not shown) can be connected to this shell 10. g

, The bottom of the casting 5 is provided with a thickened portion 15 in which is located the bore 16 plugged at one end, asat 17, while its Opposite end communicates with the interior of the shell 10 by way of a small duct 18.

The casting 5has a horizontalpartition 19 therein, this partition having an opening 20 into which; the upper end of the valve shell 21 terminates and also a large opening having the Thelow speed valve stem 21' is provided with V a threaded head 23 at its lower endfor threaded disposition into a threaded bore in the thickened portion 15. Thisstem 21 has an opening 24 therein at the point thereof traversing the bore .16, so that fuel can enter the stem and 'theoutlet of this fuel from the stemis regulated by the needle valve 25 which extends longitudinally through the stem 21'and which has 'its lower end bent laterally, as at 26, to form a handle whereby the said needle valve can be adjusted. 7

As is clearly shown in Figure 2, a high speed valve stem 27 has its lower end threaded, as at 30 28,and disposed into the thickened portion 15 so that the interior of the stem is in communication with the said bore 16. The lower por-- tion of the thickened portion 15 has a threaded opening therethrough which is normally closed 35 by a screw 29 andthrough this opening the lower portion of the stem 2'? can be reached by a tool or some suitable instrument, if desired, for any purpose.

The feed ring 22 supports and preferably has secured thereto the upstanding conical ring 30 through which the tube 31 extends, this tube being provided with a flared upper end portion 31* and will rest upon the uppermost convolution of the spring 30. The lower end of the tube 31 is cut-off at an angle, as shown at 3:1] and terminates a substantial distance upwardly from the thickened portion 15 of the carburetor casting.

Disposed upon the upper end of the tube 31 is the cylindrical coiled spring 32 which has a cap plate 33 through which extends the threaded member 34 which has a head 35 at its lower end bearing against the bottom side of the said cap plate 33. Jamb nuts 36 on the threaded member 34 are employed to bind against the cap plate 33 at its top to maintain the head 35 snugly against the bottom of the plate 33 and this head is apertured to receive the upper eye 37 of the link 38 which also has an eye 39 at its valve stem 21.

the upper end of the needle valve 41 which operates within the valve stem 27, as clearly shown in Figure 2.

As is clearly shown in Figure 3, the upstanding pipe section portion 6 of the carburetor casting has an offset portion 42 through which the short shaft 43 is journaled, this shaft being provided with a pair'of' openings 44 through which the bight portion of the bail 45 is trained. The end portions of this bail 45 are bent inwardly to provide trunnions 46-46 which can -:.be-';

sprung into corresponding openings in..the. flared upper end portion 31 of the tub'e'3Ijas 1 and 3.

This shaft 43 is provided with an arm 47 in one end and interposed between the; outer end of this arm and some stationary structure, such as-a portion of the carburetor casting, is a coiled expansible spring 48.

The-spring 48, bail 45 and associated details are employed to control the tension on the spring'30 which is adapted to withstand con siderably more suction than the spring 32.

Obviously, in the operation of this device at low speed, the suction'in the manifold will only be sufficient to draw fuel from the low speed However, as the speed increases and the suction proportionately increases,\ action takes place on the spring 32 and cap plate 33 which causes an expansion of the:

spring 32 and this; of course, gives a lifting action to the needle valve 41, besides spacing the convolutions, so that-air is sucked through the tube 31 and mixes therein with the fuel sucked from the stem 27 andthis air and fuel As the suction action increases further, the spring 30 is acted upon and this, of course, lifts upwardly on the tube 31 and in elevating the spring 32, causes a greater lift of the needle valve 41, thus opening the valve stem 27 further to permit a greater inlet of fuel.

While the foregoing specification sets forth the invention in specific terms, it-isto be understood that numerous changes, in the shape, size and materials may be resorted to without departing from the spirit and scope of the invention as claimed hereinafter.

Having described the invention, what is claimed as new is:- in the manner substantially shown, in Figures the :mixed 'fuel outlet, a tube provided with a flared end, saidtubebeingasupported 'by;;the

reduced end of the frusto-conica'lly *shaped spring by its flared endfand-being adapted to project inwardly to telescope thegztube extendingfrom the fuelrconduiha needle valve in the outer end of the fuel tube, a plate, a linked connection between the plate and the needle valve, and a normally closed extensible coiled-spring interposed betw'eentheplateand the flared end of :the first mentioned tube; said platebeing adapted to be actedaupo'n bythe usual engine suction to extend, the springxso that fuel-and air canpass outwardly of v the last mentiond spring, theifirst mentioned spring being adapted to be acted. upon by the increased suction of the engine operating at high speed to admit a greater volume of air.

, 1 HARMON I-I. EARLEJ-JT 

